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JEE Main & Advanced Mathematics Statistics Question Bank Self Evaluation Test - Statistics

  • question_answer
    The mean mark in statistics of 100 students in a class was 72. The mean mark of boys was 75. While their number was 70. The mean mark of girls in the class was

    A) 65

    B) 60

    C) 66

    D) 62

    Correct Answer: A

    Solution :

    [a] \[\frac{70\times 75+30\times x}{100}=72\Rightarrow x=65\]


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